Oil Drain Plug
The oil drain plug is the bolt at the lowest point of the oil sump that is removed to drain the old oil.
What is Oil Drain Plug?
It seals with a crush washer or O-ring, usually replaced at each oil change. Some have a magnet to catch metal particles. Some engines drain oil by suction through the dipstick tube. If the plug leaks after an oil change, the washer was often reused or the plug was not tightened correctly.
How it works
Gravity drains the oil once the plug is removed.
Why it matters for your car
Overtightening can strip threads in an aluminium sump. Use the specified torque and a new washer.
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